US PATENT SUBCLASS 388 / 839
.~.~.~ By selecting impedance

Current as of: June, 1999
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388 /   HD   ELECTRICITY: MOTOR CONTROL SYSTEMS

825  DF  OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {3}
830  DF  .~ Analog armature control {7}
838  DF  .~.~ With plural selectable speeds (e.g., with manual switch, potentiometer {1}
839.~.~.~ By selecting impedance {2}
840  DF  .~.~.~.~> Resistive
841  DF  .~.~.~.~> Inductive

DEFINITION

Classification: 388/839

By selecting impedance:

(under subclass 838) Subject matter wherein running speed is controlled by insertion of an impedance device and provision is made for selecting a device from among several having different impedance values.

(1) Note. Impedance devices include resistors, capacitors, and inductors.